WE DO THIS A LOT. HERE ARE SOME OF OUR TOP TIPS FOR A SMOOTH PARTY EXPERIENCE
Try to avoid micromanaging your party. It's fun to have themes, but in our experience, often even the birthday child does not choose options "within the theme." Kids want what they want, try to just let the fun happen how they prefer.
Do not frame your entire party around the weather! How long have you been planning it, only to put its success or failure into the lap of Houston (Houston!) weather patterns. Take it from the pros: it's not worth the stress. You'll be stressing about it for days/weeks before it, and if the worst happens, your plans are ruined. Do yourself (and your guests and vendors) a favor and plan a backup for rain.
We can't tell you how many times people forget about wind. Wind can do as much if not more damage to your decorations than rain. Try to have some good weights or tape that can secure your decorations, and if you get to your location and find it's extremely gusty, save yourself the stress and only put out what you must. We've seen whole candy buffets knocked over by wind! Plates, napkins, even food, flying everywhere. A good rule of thumb is that if you're in a wide open park near a body of water, there's a good chance you'll get some good gusts.
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Indoors is ideal
As we are sure you are well aware, Texas is hot! Our balloons, face paint, and especially artists all perform best when in a climate controlled environment. We understand that sometimes being outdoors is unavoidable, but if you have the option to put us inside, we highly recommend it. Your artist will be happier, the materials will work better, and thus the art will be at its top level. This applies during the (short) cold months as well. Frozen fingers do not operate smoothly.
We think that your guests' favorite parties are those that don't drag on. Try and plan for a few hours at most, and have cake time before too long so that those who have other appointments can leave without feeling uncomfortable.
Plan an attention grabber like pinata or cake to start just as our services end. This will give the artist a chance to make a clean break, and get the kids' minds off the fact that our time is up. Just don't forget to pay the artist before you get caught up in something else!
If you're going to do a "last call" announcement please do it minimum 20 minutes before end time. If we have 5 minutes to go, we have already cut our line and planned our last design so that we can end on time and avoid being late for another client's event. When hosts do last call and we get a handful of people lining up only to be told that we're actually out of time and have to send them away...yeah, that's awkward.